Definition of picket-pin in US English:

picket-pin

noun

North American
  • 1A pin or stake driven into the ground and used to tether an animal, secure a tent, etc.

  • 2United States regional. Any of numerous North American ground squirrels of the genus Spermophilus, which sit with a characteristic upright posture (more fully "picket-pin gopher").

Origin

Mid 19th century. From picket + pin.

Pronunciation

picket-pin

/ˈpɪkɪtpɪn/